Fixed xfce4 gtk3 panel plugin menus

[zlamalp]

This should solve bold font issue #749 in xfce4 panel plugin menus for gtk3 widgets as proposed by @xiamaz.

[NicoHood]

@xiamaz @zlamalp I tried to apply your fix and it now looks like this on my archlinux install:

Now I got two questions:

• The top bar bad normal and bold text mixed, shouldnt we make them normal for every applet?
• About SASS: It seems you have to generate the css files from SASS, but they need to be tracked by git too. This means you need to run gulp, add the css files too and commit again?

I am new to building gtk themes, maybe someone can clarify this.

[zlamalp]

Hi @NicoHood, I guess you need to modify also something else, since XFCE is now mixing GTK2 and GTK3 for panel and its applets.
I personally use bold text on panel (manually added e.g. for clock clock), but it's a matter of taste. So if you want, fix it.
SASS....I wasn't even able to install gulp using npm (as described in HACKING.md). But I guess you should modify scss file and then compile it to css and commit it as a whole as you wrote.

[NicoHood]

@zlamalp Can you please test your fix on the new release RC and open a new pr there?
arc-design/arc-theme#22

Edit: tested and fixed here: arc-design/arc-theme@4bd12f2

Please close this PR then.